Finding the Third Proportional to 2,128.25 and 3,303.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.25 : 3,303.75 = 3,303.75 : x
2. Step 2: Convert to fraction form
   2,128.25/3,303.75 = 3,303.75/x
3. Step 3: Cross multiply
   2,128.25x = 3,303.75 × 3,303.75
4. Step 4: Simplify right side
   2,128.25x = 10,914,764.06
5. Step 5: Solve for x
   x = 10,914,764.06/2,128.25
6. Step 6: Final answer
   x = 5,128.52